A 4-year-old baby with myopia needs to undergo a dilated optometry examination to determine whether the myopia is true myopia or pseudomyopia, and then be treated by improving eye habits and wearing eyeglasses to correct the myopia. 1. Genuine myopia: If a four-year-old baby has genuine myopia, because at present, genuine myopia cannot be reversed by medication or other means, the child can wear glasses to correct myopia and improve his or her vision. When the child reaches adulthood, if he/she does not want to wear glasses, he/she can be treated by refractive surgery, such as corneal laser surgery. 2. Pseudomyopia: 4-year-old baby myopia belongs to pseudomyopia, mostly just because of ciliary muscle spasm caused by temporary myopia, the child can develop good eye habits, reduce the use of electronic products, thereby relaxing the ciliary muscle, improve the child’s vision. It is recommended that children with myopia consult a doctor for evaluation of their condition and treatment under the guidance of the doctor.